CN102143821A - Power supply device for electric discharge machine - Google Patents
Power supply device for electric discharge machine Download PDFInfo
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- CN102143821A CN102143821A CN2009801340794A CN200980134079A CN102143821A CN 102143821 A CN102143821 A CN 102143821A CN 2009801340794 A CN2009801340794 A CN 2009801340794A CN 200980134079 A CN200980134079 A CN 200980134079A CN 102143821 A CN102143821 A CN 102143821A
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- supply unit
- electric discharge
- discharge machine
- electrode
- machine supply
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
- B23H1/00—Electrical discharge machining, i.e. removing metal with a series of rapidly recurring electrical discharges between an electrode and a workpiece in the presence of a fluid dielectric
- B23H1/02—Electric circuits specially adapted therefor, e.g. power supply, control, preventing short circuits or other abnormal discharges
- B23H1/022—Electric circuits specially adapted therefor, e.g. power supply, control, preventing short circuits or other abnormal discharges for shaping the discharge pulse train
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
- B23H2300/00—Power source circuits or energization
- B23H2300/20—Relaxation circuit power supplies for supplying the machining current, e.g. capacitor or inductance energy storage circuits
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Abstract
A switching element (SW1) opens and closes in the frequencies of MHz-order. A reactor (L1) resonates with the stray capacitance between the electrodes and supplies the resulting resonant current to between the electrodes. The resonant current does not flow through a DC power supply (V1). A series resonance between a capacitor (C1) and a stray inductance (Lx) allows the resonant current to be ideally supplied from the rector (L1) to between the electrodes without receiving the influence of the stray inductance (Lx). A high-frequency voltage asymmetrical in the positive and negative directions is applied between the electrodes and a current pulse can be shortened, so that finish machining with a high degree of surface roughness can be performed.
Description
Technical field
The present invention relates to a kind of will processing and be applied to the interelectrode electric discharge machine supply unit that constitutes by electric wire electrode that disposes in opposite directions and machined object, particularly relate to a kind of electric discharge machine supply unit that in fine finishining, uses in the mode of alternately switching its polarity with voltage.
Background technology
The wire electrodischarge processing unit (plant) is the device that utilizes the arc discharge that produces between the electrode that electric wire electrode and machined object by configuration in opposite directions constitute to carry out the processing of machined object.In this wire electrodischarge processing unit (plant), from (for example using bigger processing electric current, pulsewidth is tens delicate degree) the roughing condition, little by little reduce processing electric current, finally utilize the electric current pulsewidth become tens nanosecond degree the fine finishining condition improve surface roughness.Therefore, in the wire electrodischarge processing unit (plant), possess a plurality of supply units (electric discharge machine supply unit) that to supply with from the roughing condition to the corresponding processing electric current of the various processing conditions of fine finishining condition in the mode that can switch.
In fine finishining, in order to improve the surface roughness of machined object, processing is generally used the high frequency voltage of the MHz order of magnitude with voltage, the sine voltage that use can realize by simple structure.
In the past, the various electric discharge machine supply units (for example, patent documentation 1～3 etc.) of the surface roughness of machined object have been proposed to improve.
If using the symbol shown in Figure 1 of patent documentation 1 represents, then the electric discharge machine supply unit shown in the patent documentation 1 possesses dc source V1, switch element S1 and switch element S2, wherein, the end of this switch element S1 is connected to the positive terminal of dc source V1 by line inductance LINE (reactor), and be connected to the end of GAP between electrode, the end of switch element S2 is connected to the negative pole end of dc source V1 with the other end of this switch element S1, and the other end is connected to the other end of GAP between electrode.
In this structure, carry out on-off action by making switch element S1, produce the voltage raise thus.At this moment, by switch element S2 is remained the disconnection operating state, the voltage that has raise charges to parasitic capacitance Cf and the interpolar GAP that exists among the switch element S2.By flowing through the current in short bursts of the surge shape of interpolar GAP this moment, can expect the raising of surface roughness.In addition, the electric current that flows through interpolar GAP is limited by parasitic capacitance Cf.After predetermined electric current flows through interpolar GAP, by making switch element S2 ON Action, consume the electric charge that is stored among the parasitic capacitance Cf, get back to original state.Also can capacitor be set in parallel with switch element S2.
In addition, the electric discharge machine supply unit that possesses high frequency electric source has been shown in patent documentation 2, this high frequency electric source has the resonant frequency that is determined by interelectrode parasitic capacitance and inductance.Owing to utilize resonance, so the voltage that produces between electrode is not the bipolarity pulse voltage, but sine voltage.
In addition, following technology being disclosed in patent documentation 3: utilizes positive pulse and negative pulse to change the level of processing electric current, can access good surface roughness thus.Thinking why can access good surface roughness, is that interelectrode discharge condition changes because when applying positive pulse and when applying negative pulse.
Patent documentation 1: TOHKEMY 2005-329498 communique
Patent documentation 2: Japanese kokai publication hei 5-177435 communique
Patent documentation 3: No. 3361057 communique of Japan Patent
Summary of the invention
At this, consider that the circuit structure that utilizes patent documentation 1 to be put down in writing carries out the situation of high frequency action.In patent documentation 1, just utilize reactor, but can infer and carry out resonance and move by carrying out parasitic capacitance that the high frequency action has reactor and switch element S2 in order to carry out copped wave control.At this moment, by the connection of switch element S1, the voltage that the disconnection action produces the surge shape, therefore think unlike patent documentation 2 put down in writing, to be applied in sine voltage between electrode, though but to be applied in be that resonance moves the voltage of waveform shape of the distortion that also is attended by oscillationg component.That is, between electrode, apply basically such as patent documentation 3 the positive and negative asymmetrical potential pulse the record.Can think that this improves for surface roughness is effective.
But in the circuit structure that patent documentation 1 is put down in writing, resonance current flows via dc source V1, therefore has following problem: (1) causes the instability action of dc source; And (2) resonance current produces loss owing to the internal driving of dc source.Below, describe particularly.
(1) unstability of dc source action
In general dc source is controlled so as to the maintenance constant voltage.If dc source is got involved in the loop of resonance current, then dc source self also might vibrate and deficient in stability.A few m Ω～several Ω), short-circuit condition (resistance value: change significantly a few n Ω～a few m Ω) interelectrode state is not necessarily constant all the time, as from absence of discharge state (resistance value: tens k Ω～a few M Ω) to discharge condition (resistance value:.Particularly the interelectrode state under the absence of discharge state be resistive element, is not so good as the capacitor of thinking to have interelectrode capacity.At this, under the unmatched situation of formed capacitor between vibration that dc source produced and electrode, the voltage across poles change becomes unsettled processing more than required easily.Perhaps, unnecessarily make the surface roughness variation easily.
(2) loss due to the internal driving
There is impedance in inside at dc source.Make resonance current flow through the inside of dc source by constituting, can produce a lot of losses thus.Therefore in addition, the internal inductance composition of dc source also becomes the part of resonance constant, causes the resonance imbalance because structure, the state of dc source change, so can not flow through desired resonance current between electrode.Therefore, be difficult to obtain stable processing.
The present invention finishes in view of described situation, purpose is to obtain a kind of electric discharge machine supply unit, under situation about constituting by dc source, switch element and reactor, can eliminate the instability action of dc source and the loss due to the internal driving, stably carry out the high fine finishining of surface roughness.
In order to reach described purpose, electric discharge machine supply unit of the present invention applies pulse voltage between the electrode that is made of electrode and machined object, and this electric discharge machine supply unit is characterised in that to possess: dc source; Capacitor, and be connected in series between described electrode; Reactor, and between described electrode and the series circuit of described capacitor be connected in parallel, and an end of this reactor is connected with an end of described dc source; And switch element, an end of this switch element is connected with the other end of described dc source, and the other end of this switch element is connected with the other end of described reactor.
According to the present invention, play following effect: under situation about constituting, can eliminate the instability action of dc source and the loss due to the internal driving, can stably carry out the high fine finishining of surface roughness by dc source, switch element and reactor.
Description of drawings
Fig. 1 is the circuit diagram of structure of the electric discharge machine supply unit of expression embodiments of the present invention 1.
Fig. 2 is expression to the figure of an example of the control signal waveform of switch element shown in Figure 1 and the voltage waveform that applies between electrode this moment.
Fig. 3 is the circuit diagram of structure of the electric discharge machine supply unit of expression embodiments of the present invention 2.
Fig. 4 is expression to the figure of an example of the control signal waveform of switch element shown in Figure 3 and the voltage waveform that applies between electrode this moment.
Fig. 5 is the circuit diagram of structure of the electric discharge machine supply unit of expression embodiments of the present invention 3.
Fig. 6 is expression to the figure of an example of the control signal waveform of a plurality of switch elements shown in Figure 5 and the voltage waveform that applies between electrode this moment.
Fig. 7 is the circuit diagram of structure of the electric discharge machine supply unit of expression embodiments of the present invention 4.
Fig. 8 is the circuit diagram of structure of the electric discharge machine supply unit of expression embodiments of the present invention 5.
Fig. 9 is the figure of the structure example of explanation when electric discharge machine supply unit shown in Figure 8 is applied to the wire electrodischarge processing unit (plant).
Figure 10 is the circuit diagram of structure of the electric discharge machine supply unit of expression embodiments of the present invention 6.
Description of reference numerals
1a, 1b, 1c, 1d, 1e, 1f: electric discharge machine supply unit; 2: the electric wire electrode; 3: machined object; V1: dc source; SW1, SW2, SW3, SW4: switch element; L1: reactor; C1, C2, C11, C21, C22: capacitor; Lx: stray inductance; Ly: reactor (inductive load); Cy: capacitor (capacity load); T1: transformer.
The specific embodiment
Below, describe the embodiment of electric discharge machine supply unit involved in the present invention with reference to the accompanying drawings in detail.In addition, the present invention is not limited by this embodiment.
Fig. 1 is the circuit diagram of structure of the electric discharge machine supply unit of expression embodiments of the present invention 1.In Fig. 1, electric discharge machine supply unit 1a is following supply unit: the processing voltage that will be fit to the fine finishining condition, alternately be applied between the electrode that constitutes by electric wire electrode 2 that disposes in opposite directions and machined object 3 in the mode of switching its polarity, make the required arc discharge of fine finishining that produces machined object 3 between electrode.
Be connected by power cable between electric discharge machine supply unit 1a and electrode.Near interelectrode, particularly in the power cable that will be connected between electric discharge machine supply unit 1a and electrode, have many stray inductances.Lx shown in Figure 1 represents this stray inductance.In Fig. 1,, there is stray inductance too in electric wire electrode 2 sides though only show the stray inductance that is present in machined object 3 sides.
Electric discharge machine supply unit 1a comprises dc source V1, switch element SW1, reactor L1 and capacitor C1.
In example shown in Figure 1, switch element SW1 is FET (field-effect transistor), is connected to for example positive terminal of dc source V1 as the drain terminal of an end, is connected to for example electric wire electrode 2 as the source terminal of the other end with the end of reactor L1.Never illustrated control circuit provides the control signal of the switching frequency that becomes the MHz order of magnitude to the gate terminal of switch element SW1.
Reactor L1 has the inductance value that becomes resonant condition with interelectrode parasitic capacitance under the frequency of the MHz order of magnitude.The other end of reactor L1 is connected to the negative pole end of dc source V1 in example shown in Figure 1, be also connected to machined object 3.
Capacitor C1 is chosen to be with stray inductance Lx becomes the such capacitance of resonant condition.In example shown in Figure 1, capacitor C1 is present in the other end of reactor L1 and the access path of machined object 3, but also may reside in the end of reactor L1 and the access path of electric wire electrode 2.In a word, the series resonant circuit that is made of capacitor C1 and stray inductance Lx is connected in series between electrode.
In addition, capacitor C1 may not be the form of so-called capacitor.For example also can utilize the center conductor of coaxial cable and the electric capacity between the crust conductor, can also use insulants (dielectric) such as ceramic substrate to realize needed capacitance in addition.
Then, with reference to Fig. 2 action is described.Fig. 2 is expression to the figure of an example of the control signal waveform of switch element shown in Figure 1 and the voltage waveform that applies between electrode this moment.
As shown in Figure 2, never illustrated control circuit is to the gate terminal of switch element SW1, input width turn-on time be during t1 and turn-off time width be during the control signal of s1.Switch element SW1 is according to this control model, carries out the on-off action under the high frequency of the MHz order of magnitude.So reactor L1 by as described later and the effect of capacitor C1 apply the such high frequency voltage with positive and negative asymmetrical waveform of Vg as shown in Figure 2 between electrode.
Switch element SW1 be in the ON Action state during t1, electric current flows to reactor L1 from dc source V1.Resolve the moment of starting work at switch element SW1, the energy that is stored among the reactor L1 is output between electrode.
At this moment, for example be made as under the situation of the high frequency more than the 5MHz, become resonant condition between reactor L1 and the interelectrode parasitic capacitance, can between electrode, apply the stable continuous pulse in on-off action frequency with switch element SW1.
At this,, current impulse is shortened in order to improve the surface roughness of machined object 3.But, resolve stray inductance Lx that rapid pulse that moment of starting work produces exists in owing to interelectrode parasitic capacitance, power cable at switch element SW1 in reactor L1 and cause rising and become slow, therefore be difficult to current pulse shapes carry out short pulseization.
Therefore, about capacitor C1, to become the selected constant of mode of resonant condition, to insert capacitor C1 with respect to becoming the mode that is connected in series between electrode with stray inductance Lx.If capacitor C1 and stray inductance Lx become the series resonance state, then the resonance current that is caused by the energy that produces among the reactor L1 can not be subjected to the influence of stray inductance Lx, and can supply with ideally between electrode.Thus, realize flowing through the short pulseization of interelectrode current impulse.
Because this resonance current is not flowing through between electrode and between the reactor L1 via dc source V1, therefore can not produce loss because of the internal driving that dc source V1 is had.And this resonance current can not bring influence to dc source V1 yet.Thus, stable high-frequency impulse can be between electrode, provided, the high processing of surface roughness can be stably carried out.
At this, there is meaning in illustrated capacitor C1.Inductance L x is a stray inductance, can think it is very little inductance at least with respect to reactor L1.Suppose not to be inserted into system if will also not have the capacitor C1 of the function of blocking-up flip-flop, then the electric current of dc source V1 begins to carry out between the moment inflow electrode of ON Action at switch element SW1.Discharge herein according to the value that applies voltage that between electrode, applies.Therefore the discharge current of this moment becomes very big owing to there is not the intervention (not having the electric current limiting resistance) of resistance.
Thus, surface roughness variation.Perhaps, under the situation that is in short-circuit condition between electrode, short circuit current flow.Flow through when the electric current more than the design load under the situation of switch element SW1, also might destroy switch element SW1 self.As switch element SW1, need the selected big current element that can guarantee short circuit current conversely speaking,, therefore make circuit become complexity and expensive circuit easily.
Relative therewith, as shown in Figure 1, if capacitor C1 in series is inserted into system, then source current charges to capacitor C1 and finishes, so voltage across poles can rise necessarily, and short circuit current can not continue to flow yet.And,, on average remain 0V between electrode by this capacitor C1.
Yet as shown in Figure 2, the positive and negative of the voltage that applies between electrode may not be symmetrical.That is to say that though the area of current waveform (quantity of electric charge) is positive and negative symmetry, peak point current is to determine according to the connection of the reactor L1, the switch element SW1 that form the surge pulse, disconnection timing etc., therefore obtains the waveform that is out of shape as shown in Figure 2.At this moment, by setting the polarity that applies voltage, can expect to improve surface roughness so that the peak point current of electric wire electrode 2 is higher than the mode of machined object 3.
As mentioned above, according to present embodiment 1, about the resonance current that produces by the resonance that causes because of interelectrode parasitic capacitance and reactor, can not flow to dc source, by making capacity load (capacitor C1 or coaxial cable or insulant) and stray inductance become resonant condition, thereby can flow between electrode ideally.
That is to say that the resonance current that produces in the reactor can not flow via dc source, so dc source can not become unstable yet, the resonance current of supplying with between electrode can not produce loss owing to the internal resistance of dc source yet.And, between electrode, apply positive and negative asymmetrical high frequency voltage, can realize the short pulseization of current impulse, therefore can stably carry out the high fine finishining of surface roughness.
Fig. 3 is the circuit diagram of structure of the electric discharge machine supply unit of expression embodiments of the present invention 2.In addition, in Fig. 3, or equivalent configurations key element identical with the structural element shown in Fig. 1 (embodiment 1) have been added identical Reference numeral.At this, be that the center describes with the part relevant with present embodiment 2.
As shown in Figure 3, the electric discharge machine supply unit 1b of present embodiment 2 and is connected with between electrode as the capacitor Cy of capacity load and series circuit as the reactor Ly of inductive load in the structure shown in Fig. 1 (embodiment 1) in parallel.This series circuit is the circuit that carries out resonance with interelectrode parasitic capacitance.
In addition, capacitor Cy may not be the form of so-called capacitor, also can be beyond this electric discharge machine supply unit 1b supply unit, promptly be the supply unit that the supply unit used of for example roughing etc. is through with and applies to interelectrode voltage.In addition, reactor Ly also may not be the form of so-called reactor, also can be the stray inductance that for example power cable had.
Then, with reference to Fig. 4 action is described.Fig. 4 is expression to the figure of an example of the control signal waveform of switch element shown in Figure 3 and the voltage waveform that applies between electrode this moment.Be that with the difference of Fig. 2 the frequency that applies voltage Vg that applies changes with the frequency of twice between electrode.In addition, this is an example, is not limited thereto.
In structure shown in Figure 3, except the resonance of interelectrode parasitic capacitance and reactor L1, the formed parallel circuit of series circuit of interelectrode parasitic capacitance and reactor Ly and capacitor Cy also can produce resonance.Thereby, if suitably selected reactor Ly and capacitor Cy, then as shown in Figure 4 could be to applying the voltage Vg that changes with the frequency more than the operating frequency (switching frequency) of switch element SW1 between electrode.In this case, the frequency that applies voltage Vg that between electrode, applies so long as the integral multiple of the operating frequency of switch element SW1 just can carry out stable voltage and apply.
At this, under the resonant condition of this integral multiple, particularly when resonance current flows through dc source V1, become significantly because of the loss due to the internal driving of dc source V1 causes decay, therefore produce following situation: during the voltage waveform that produces of t1 with during the peak value of the voltage waveform that produces of s1 differ widely.
To this, if in parallel between reactor L1 and electrode, and and electrode between in series get involved the structure of the present embodiment that capacitor C1 is arranged, then resonance current is not by dc source V1, therefore during the voltage waveform that produces of t1 with during the difference of peak value of the voltage waveform that produces of s1 less, voltage across poles Vg can be applied with the form of constant voltage, the high fine finishining of surface roughness can be stably carried out.
As mentioned above, according to present embodiment 2, owing to further resonance circuit is connected between electrode, therefore can compare further raising surface roughness with embodiment 1 to applying the positive and negative asymmetrical high frequency voltage that changes with the frequency more than the switching frequency of switch element (frequency of integral multiple) between electrode.
Fig. 5 is the circuit diagram of structure of the electric discharge machine supply unit of expression embodiments of the present invention 3.In addition, in Fig. 5, or equivalent configurations key element identical with the structural element shown in Fig. 1 (embodiment 1) have been added identical Reference numeral.At this, be that the center describes with the part relevant with present embodiment 3.
In embodiment 1,2, show the situation of using a switch element between electrode, to apply the high frequency voltage of the MHz order of magnitude, but utilize the frequency of the very difficult voltage that will between electrode, apply of a switch element to be increased to several MHz～tens MHz orders of magnitude, therefore in present embodiment 3, the structure example of the situation of the high frequency voltage that uses a plurality of switch elements that are connected in parallel to apply several MHz～tens MHz orders of magnitude between electrode is shown.
As shown in Figure 5, about the electric discharge machine supply unit 1c of present embodiment 3, in the structure shown in Fig. 1 (embodiment 1), switch element SW1 three switch element SW2, SW3, SW4 for example have been arranged in parallel.
Flow into interelectrode resonance current and dc source V1 is independently according to the resonance of interelectrode parasitic capacitance and reactor L1, this stability for processing is very important, but thinks that working as resonance potential is to dc source V1 regenerative current under the above situation of supply voltage.Therefore, in Fig. 5, in order further to improve the independence of dc source V1, and between each drain terminal of the positive terminal of dc source V1 and four switch element SW1, SW2, SW3, SW4, be provided with diode D1, D2, D3, the D4 of adverse current prevention usefulness.In Fig. 1, Fig. 3, omitted diagram and explanation, but, the diode that adverse current stops usefulness has been set equally preferably according to same aim.
Then, with reference to Fig. 6 action is described.Fig. 6 is expression to the figure of an example of the control signal waveform of a plurality of switch elements shown in Figure 5 and the voltage waveform that applies between electrode this moment.
As shown in Figure 6, move successively circularly,, can increase the frequency synthesis of the resonance current that flows to reactor L1 though reduced by four switch element SW1～SW4 operating frequency separately by making four switch element SW1～SW4.
At this moment, even four switch element SW1～SW4 all are chosen to be identical kind, also can expect easily aspect characteristic, can having deviation knifeedge.Perhaps, because the cloth ray mode has nothing in common with each other, the output pulse also can produce deviation knifeedge.
Therefore, in present embodiment 3, make the switching mode difference in order to proofread and correct this deviation.Specifically, for example consider following situation: compare with switch element SW1, SW2, SW4, switch element SW3 electric current is flow through or switching speed very fast.In this case, equate, as long as width turn-on time among t1, t2, the t4 was short during width turn-on time during making among the t3 compared in order to make the storage power in reactor L1.
Thus, the energy of reactor L1 becomes when carrying out each switch motion evenly, therefore also can reduce deviation for voltage across poles, can access stable processability.Similarly, cause owing to wiring is variant knifeedge the vibration period at the discrepant situation of each element under, as long as adjust switch element SW1, SW2, SW4 turn-off time width promptly during s1, s2, s4 beginning regularly.
These are selected to be respectively independently.As long as when as required the beginning of turn-on time regularly being moved forwards, backwards, the beginning of turn-off time regularly moved forwards, backwards get final product.Thus, voltage across poles Vg can be made as have the stable cycle, the pulse voltage of magnitude of voltage.
As mentioned above, according to present embodiment 3, the chopper frequency (chopper frequency) of reactor is increased to more than the operating frequency of switch element, therefore can realize interelectrode further high frequencyization, compare the raising that can further realize surface roughness with embodiment 2.
Fig. 7 is the circuit diagram of structure of the electric discharge machine supply unit of expression embodiments of the present invention 4.In addition, in Fig. 7, or equivalent configurations key element identical with the structural element shown in Fig. 1 (embodiment 1) have been added identical Reference numeral.At this, be that the center describes with the part relevant with present embodiment 4.
As shown in Figure 7, in the electric discharge machine supply unit 1d of present embodiment 4, in the structure shown in Fig. 1 (embodiment 1), replace reactor L1 and be provided with transformer T1.That is, an end of the primary side of transformer T1 is connected to the positive terminal of dc source V1 via switch element SW1, and the other end is connected to the negative pole end of dc source.In addition, an end of the primary side of transformer T1 is connected to electric wire electrode 2, and the other end is connected to machined object 3 via capacitor C1.
Transformer T1 and reactor L1 similarly constitute resonance circuit with interelectrode parasitic capacitance.The primary side by changing transformer T1 and the turn ratio of primary side also reduce the number of turn of primary side, can realize the lower voltage of dc source V1.As implementing as described in the mode 1～3,, select the number of turn of the primary side of transformer T1 according to the resonance constant of the inductance composition of interelectrode parasitic capacitance and transformer T1.
The action of switch element SW1 is identical with embodiment 1.By using transformer T1, can completely cut off dc source V1, so the independence between resonance circuit and the dc source V1 improves.
According to this structure, the resonance current that produces in the inductance of transformer T1 and the resonance circuit of interelectrode parasitic capacitance can not influence dc source V1, on the contrary, therefore dc source V1 can stably not carry out the high fine finishining of surface roughness owing to resonance current is affected yet.
At this moment, when considering not have the perfect condition of leakage magnetic flux etc., identical with Fig. 1 from the equivalent circuit of seeing between electrode.That is to say, can obtain the effect identical with embodiment 1.In patent documentation 2, thereby between electrode, apply sine voltage, but in present embodiment 4,, therefore compare and improved surface roughness with patent documentation 2 owing to between electrode, apply positive and negative asymmetrical pulse voltage by using AC power to produce resonance.
In addition, in present embodiment 4, show the application examples that is applied to embodiment 1, but also can similarly be applied to embodiment 2.
In addition, also can place of switches element SW1 and use a plurality of switch elements that are connected in parallel as shown in Embodiment 3 like that.And, also can be as enforcement mode 3 be illustrated, in Fig. 7, between the drain terminal of the positive terminal of dc source V1 and switch element SW1, insert the diode that adverse current stops usefulness.
Fig. 8 is the circuit diagram of structure of the electric discharge machine supply unit of expression embodiments of the present invention 5.In addition, in Fig. 8, or equivalent configurations key element identical with the structural element shown in Fig. 1 (embodiment 1) have been added identical Reference numeral.At this, be that the center describes with the part relevant with embodiment 5.
As shown in Figure 8, in the electric discharge machine supply unit 1e of present embodiment 5, in the structure shown in Fig. 1 (embodiment 1), also append in electric wire electrode 2 sides and to have inserted capacitor C2.
Owing near between electrode, have spurious impedance (not shown), therefore might hinder reactor L1 and interelectrode resonance.In embodiment 1～4, the situation that the inductance composition (stray inductance Lx) that utilizes capacitor C1 to make this spurious impedance becomes invalid has been described.But, in fact in path in parallel, there is parasitic capacitance (not shown), therefore think between this parasitic capacitance and stray inductance Lx, to cause resonance.Therefore, in present embodiment 5, in series insert capacitor, thereby can block the resonance with parasitic capacitance by the many places between between dc source V1 and electrode.
About the capacitance that inserts between between reactor L1 and electrode, the combined capacity value that it is desirable to can be used as capacitor C1, C2 is obtained.Thereby, each capacitance of capacitor C1, C2 can be to be worth arbitrarily, but be present in parallel at described parasitic capacitance and stray inductance Lx under the situation in somewhere in path in parallel, be applied to interelectrode voltage waveform and become better by making the capacitor C1 that inserts to the path of an interelectrode side and different adjustment of each capacitance, can making thus to the capacitor C2 of the path of interelectrode opposite side insertion.
Then, with reference to Fig. 9 concrete application examples is described.Fig. 9 is the figure of the structure example of explanation when electric discharge machine supply unit shown in Figure 8 is applied to the wire electrodischarge processing unit (plant).
As shown in Figure 9, in the wire electrodischarge processing unit (plant), from up and down two supplying with processing electric currents to electric wire electrode 2 by top feed line 4 and bottom feed line 5.In this case, how unclear described spurious impedance (not shown) exists, and also thinks different with the potential pulse of supplying with from the bottom feed line from the potential pulse of top feed line 4 supplies.In this case, might apply degradation problem under the voltage.
Therefore, adjust waveform, can make best high frequency waveforms by near two distributing points, in series inserting with the corresponding capacitor C21 of capacitor C2, C22.In addition, by also insert corresponding capacitor C11 in machined object 3 sides, can make best high frequency waveforms with capacitor C1.
In addition, the example that is applied to embodiment 1 has been shown in present embodiment 5, but also can similarly be applied to embodiment 2～4.
Embodiment 6.
Figure 10 is the circuit diagram of structure of the electric discharge machine supply unit of expression embodiments of the present invention 6.In addition, in Figure 10, or equivalent configurations key element identical with the structural element shown in Fig. 8 (embodiment 5) have been added identical Reference numeral.At this, be that the center describes with the part relevant with present embodiment 6.
As shown in figure 10, in the electric discharge machine supply unit 1f of present embodiment 6, in the structure shown in Fig. 8 (embodiment 5), on the path of the negative side of dc source V1, also be provided with switch element SW2.
For high frequencyization, voltage is short pulse between preferred electrode, and in order to obtain sufficient working ability, voltage is high voltage between preferred electrode.When mains side considers to satisfy the countermeasure of these requirements, be to make the switch element high speed.
Therefore, in present embodiment 6, as shown in figure 10, be provided with switch element SW1, SW2 at the side of the positive electrode of dc source V1 and the path, two ends of negative side.By two switch SW 1, SW2 are connected simultaneously, disconnect, can connect, cut off dc source V1 and reactor L1 at high speed, can improve the excitation voltage that produces among the reactor L1.Thus, the voltage that produces between electrode short pulseization, Towards Higher Voltage can be carried out, better machined surface precision can be obtained.
In addition, in present embodiment 6, show the example that is applied to embodiment 5, but also can similarly be applied to embodiment 1～4.
Utilizability on the industry
As mentioned above, electric discharge machine supply unit involved in the present invention is applicable to and can stably carries out the high accurately machined electric discharge machine supply unit of surface roughness.
Claims (20)
1. an electric discharge machine supply unit applies pulse voltage between the electrode that is made of electrode and machined object, and this electric discharge machine supply unit is characterised in that to possess:
Dc source;
Capacitor, and be connected in series between described electrode;
Reactor, and between described electrode and the series circuit of described capacitor be connected in parallel, and an end of this reactor is connected with an end of described dc source; And
Switch element, an end of this switch element is connected with the other end of described dc source, and the other end of this switch element is connected with the other end of described reactor.
2. an electric discharge machine supply unit applies pulse voltage between the electrode that is made of electrode and machined object, and this electric discharge machine supply unit is characterised in that to possess:
Dc source;
Capacitor, and be connected in series between described electrode;
Transformer, an end of the primary side of this transformer is connected with an end of described dc source, is connected with the two ends of the series circuit of described capacitor between the primary side of this transformer and described electrode; And
Switch element, an end of this switch element is connected with the other end of described dc source, and the other end of this switch element is connected with the other end of the primary side of described transformer.
3. electric discharge machine supply unit according to claim 1 is characterized in that,
Between an end of end of described dc source and described reactor, be provided with switch element.
4. electric discharge machine supply unit according to claim 1 is characterized in that,
Described capacitor in series is arranged at described interelectrode one-sided path or in series is arranged at described interelectrode two side paths respectively.
5. electric discharge machine supply unit according to claim 1 is characterized in that,
Be provided with switch element between an end of end of described dc source and described reactor, described capacitor in series is arranged at described interelectrode one-sided path or in series is arranged at described interelectrode two side paths respectively.
6. electric discharge machine supply unit according to claim 2 is characterized in that,
Between an end of the primary side of end of described dc source and described transformer, be provided with switch element.
7. electric discharge machine supply unit according to claim 2 is characterized in that,
Described capacitor in series is arranged at described interelectrode one-sided path or in series is arranged at described interelectrode two side paths respectively.
8. electric discharge machine supply unit according to claim 2 is characterized in that,
Be provided with switch element between an end of the primary side of end of described dc source and described transformer, described capacitor in series is arranged at described interelectrode one-sided path or in series is arranged at described interelectrode two side paths respectively.
9. electric discharge machine supply unit according to claim 1 is characterized in that,
Replace described switch element and be provided with a plurality of switch elements that are connected in parallel,
Each control terminal of these a plurality of switch elements is provided the control signal that feasible order with regulation is carried out on-off action.
10. electric discharge machine supply unit according to claim 2 is characterized in that,
Replace described switch element and be provided with a plurality of switch elements that are connected in parallel,
Each control terminal of these a plurality of switch elements is provided the control signal that feasible order with regulation is carried out on-off action.
11. electric discharge machine supply unit according to claim 1 is characterized in that,
Replace described switch element and be provided with a plurality of switch elements that are connected in parallel,
Should a plurality of switch elements be controlled to turn-on time width or turn-off time width different.
12. electric discharge machine supply unit according to claim 2 is characterized in that,
Replace described switch element and be provided with a plurality of switch elements that are connected in parallel,
With described a plurality of switch elements be controlled to turn-on time width or turn-off time width different.
13. electric discharge machine supply unit according to claim 1 is characterized in that,
With between described electrode, be connected with in parallel with described interelectrode parasitic capacitance and constitute the inductive load of resonance circuit and the series circuit of capacity load.
14. electric discharge machine supply unit according to claim 2 is characterized in that,
With between described electrode, be connected with in parallel with described interelectrode parasitic capacitance and constitute the inductive load of resonance circuit and the series circuit of capacity load.
15. electric discharge machine supply unit according to claim 1 is characterized in that,
Replace described capacitor and use coaxial cable or insulant.
16. electric discharge machine supply unit according to claim 2 is characterized in that,
Replace described capacitor and use coaxial cable or insulant.
17. electric discharge machine supply unit according to claim 1 is characterized in that,
With between described electrode, be connected with in parallel with described interelectrode parasitic capacitance and constitute the inductive load of resonance circuit and the series circuit of capacity load,
Described inductive load is the stray inductance that exists in reactor or described interelectrode voltage feed path.
18. electric discharge machine supply unit according to claim 2 is characterized in that,
With between described electrode, be connected with in parallel with described interelectrode parasitic capacitance and constitute the inductive load of resonance circuit and the series circuit of capacity load,
Described inductive load is the stray inductance that exists in reactor or described interelectrode voltage feed path.
19. electric discharge machine supply unit according to claim 1 is characterized in that,
With between described electrode, be connected with in parallel with described interelectrode parasitic capacitance and constitute the inductive load of resonance circuit and the series circuit of capacity load,
Described capacity load is to be through with to apply other supply unit of action to described interelectrode voltage.
20. electric discharge machine supply unit according to claim 2 is characterized in that,
With between described electrode, be connected with in parallel with described interelectrode parasitic capacitance and constitute the inductive load of resonance circuit and the series circuit of capacity load,
Described capacity load is to be through with to apply other supply unit of action to described interelectrode voltage.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2008-224619 | 2008-09-02 | ||
| JP2008224619 | 2008-09-02 | ||
| PCT/JP2009/054464 WO2010026790A1 (en) | 2008-09-02 | 2009-03-09 | Power supply device for electric discharge machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102143821A true CN102143821A (en) | 2011-08-03 |
| CN102143821B CN102143821B (en) | 2012-09-12 |
Family
ID=41796966
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009801340794A Active CN102143821B (en) | 2008-09-02 | 2009-03-09 | Power supply device for electric discharge machine |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US8735763B2 (en) |
| JP (1) | JP5202639B2 (en) |
| CN (1) | CN102143821B (en) |
| DE (1) | DE112009002139T5 (en) |
| WO (1) | WO2010026790A1 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103464844A (en) * | 2013-09-26 | 2013-12-25 | 苏州群伦精密机电工业有限公司 | Discharge processing circuit |
| CN106513878A (en) * | 2016-12-07 | 2017-03-22 | 上海中轩汽车零部件有限公司 | Practical power supply for electric discharge machining |
| CN107803563A (en) * | 2017-12-04 | 2018-03-16 | 北京弘融电子科技有限公司 | Spark pulse power loop |
| CN108672851A (en) * | 2018-06-08 | 2018-10-19 | 中国工程物理研究院机械制造工艺研究所 | A kind of very high frequency(VHF) self-vibration declines can electric machining clock |
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| JP5165061B2 (en) * | 2008-07-24 | 2013-03-21 | 三菱電機株式会社 | Electric discharge machining apparatus, electric discharge machining method, and semiconductor substrate manufacturing method |
| DE112012002360T5 (en) | 2011-06-06 | 2014-02-27 | Mitsubishi Electric Corp. | HIGH FREQUENCY POWER SOURCE GENERATING DEVICE |
| JP2016123258A (en) * | 2014-06-02 | 2016-07-07 | パナソニックＩｐマネジメント株式会社 | Switching power source and charging device |
| US10298138B2 (en) | 2017-08-31 | 2019-05-21 | Google Llc | Programmable power adapter |
| US10277140B2 (en) | 2017-08-31 | 2019-04-30 | Google Llc | High-bandwith resonant power converters |
| JP7032561B2 (en) * | 2018-10-31 | 2022-03-08 | 株式会社牧野フライス製作所 | Power supply for electric discharge machine |
| TWI779362B (en) * | 2020-09-30 | 2022-10-01 | 國立虎尾科技大學 | Power electrical circuit for electrical discharge machine and electrical discharge machine using the same |
| WO2022162785A1 (en) * | 2021-01-27 | 2022-08-04 | 三菱電機株式会社 | Power source device |
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| JPS5290895A (en) * | 1976-01-26 | 1977-07-30 | Hitachi Ltd | Electric source for electro spark machining |
| JPS61260922A (en) * | 1985-05-15 | 1986-11-19 | Mitsubishi Electric Corp | Power source for electric discharge machining |
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- 2009-03-09 CN CN2009801340794A patent/CN102143821B/en active Active
- 2009-03-09 WO PCT/JP2009/054464 patent/WO2010026790A1/en active Application Filing
- 2009-03-09 JP JP2010527719A patent/JP5202639B2/en active Active
- 2009-03-09 US US13/061,719 patent/US8735763B2/en not_active Expired - Fee Related
- 2009-03-09 DE DE112009002139T patent/DE112009002139T5/en not_active Withdrawn
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103464844A (en) * | 2013-09-26 | 2013-12-25 | 苏州群伦精密机电工业有限公司 | Discharge processing circuit |
| CN106513878A (en) * | 2016-12-07 | 2017-03-22 | 上海中轩汽车零部件有限公司 | Practical power supply for electric discharge machining |
| CN107803563A (en) * | 2017-12-04 | 2018-03-16 | 北京弘融电子科技有限公司 | Spark pulse power loop |
| CN107803563B (en) * | 2017-12-04 | 2023-12-22 | 北京弘融电子科技有限公司 | Electric spark pulse power supply loop |
| CN108672851A (en) * | 2018-06-08 | 2018-10-19 | 中国工程物理研究院机械制造工艺研究所 | A kind of very high frequency(VHF) self-vibration declines can electric machining clock |
Also Published As
| Publication number | Publication date |
|---|---|
| DE112009002139T5 (en) | 2012-01-12 |
| JPWO2010026790A1 (en) | 2012-02-02 |
| WO2010026790A1 (en) | 2010-03-11 |
| US8735763B2 (en) | 2014-05-27 |
| US20110163071A1 (en) | 2011-07-07 |
| JP5202639B2 (en) | 2013-06-05 |
| CN102143821B (en) | 2012-09-12 |
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